Today I changed a radiator i.e. single to a double, which ment I drained teh central heating system and altered the pipework. When I commissioned the system I found that the heating system is working ok (radiators very hot) but the hot water is now warm only. What have I done to cause this problem?

Kevin H, February 2011

probably air in the h/water circuit put h/water only on may take a while to shift air but should do it

brian, February 2011